A unit of area equal to 10,000 square metres (107,639 sq ft), or one square hectometre (100 metres, squared), and commonly used for measuring land area.
(abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters)
(abbreviated `ha'') a unit of surface area equal to 100 ares (or 10,000 square meters)
